Sorry I'll have to debate this one (even though ignorant to many concepts of minotaurs) logically it makes no sense. Although I will also admit I've never seen a female minotaur.
In concept,minotaurs are parasitic species,they take females from other species cuz generally their own species produces almost no females(in most cases authors opt for having the race without females),its a concept used in a lot of fantasy species(lately it has turned itself a popular concept to define futa's as species),
I am very much aware of the scientific biology of horned babies BUT its heavily implied by the way the Orcs were talking & what Julia says about Molly this particular baby torn her womb... I think she must have small horns. Gotta remeber Minotaurs are not normal animals.
Its totally defined a vital flaw when happens this kind of thing,i mean,it is a kind of thing that make a specie impossible to give viable offspring,if Molly was fated to death,it means that minotaurs cant breed with humans in this universe,their birth rates would've too low,and their presence would prove itself a nuisance worse than goblins...